I'm curious how you sell a Netherhound - not doubting the claim, I'm just not sure how it's done. Are they eggs? Can you eggify Netherhounds?

For approximately a week after release, it was possible to eggify a Netherhound due to a glitch. The resulting egg had a red item name. This was unintended and has since been patched - it is no longer possible to obtain Netherhound Eggs except through other players.

If hatched, the Netherhound will keep its red-text name, and can be tamed. If renamed, it will lose its red name. If you breed two Netherhounds together, only a standard wolf will be born. If you eggify a Netherhound after spawning, it will still keep its red name.